[smartBridges] Horizontal Polarity

[TJ Burbank]

We are using APPO's  and on a particular hilltop we have 3 vertical polarized APPO's using channels 1,6,11 seperated by 10-20 feet.   We are getting close to maxing out all 3 access points with users.  Would it be possible to re-use these channels with Horizontal polarized antennas?   If so what kind of seperation would I need to keep from causing myself interference.   Thanks in advance for your help,   -TJ Burbank